i.fusion.brovey1grass
Brovey transform to merge multispectral and high-res panchromatic channels
Usage
i.fusion.brovey
i.fusion.brovey help
i.fusion.brovey [-lqs]
ms1=string
ms2=string
ms3=string
pan=string
outputprefix=string
[--overwrite]
[--verbose]
[--quiet]
Keywords
imagery, fusion, Brovey
Overview
i.fusion.brovey performs a Brovey transformation using three multispectral and the panchromatic satellite image scene channels. Three new channels are calculated according to the formula:
DN_b1
DN_fused = ------------------------------- * DN_pan
DN_b1 + DN_b2 + DN_b3
The assignment of the channels depends on the satellite. The module's help text (above) suggests for LANDSAT-7, QuickBird and SPOT.
Notes
The command changes temporarily to the high resolution of the panchromatic channels for creating the three output channels, then restores the previous region settings. The current region coordinates are respected. The three pan-sharpened output channels may be combined with d.rgb or r.composite.
Examples
Calculation of Brovey fusion map from North Carolina Landsat scene:
g.region rast=lsat7_2002_20 -p
# R, G, B composite at 28.5m
d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
# Brovey fusion
i.fusion.brovey -l ms1=lsat7_2002_20 ms2=lsat7_2002_40 \
ms3=lsat7_2002_50 pan=lsat7_2002_80 \
outputprefix=brovey
# display at 14.25m
g.region rast=brovey.blue -p
d.rgb b=brovey.blue g=brovey.green r=brovey.red
Results:
|
R, G, B composite of Landsat at 28.5m |
R, G, B composite of Landsat Brovey fusion at 14.25m
Colors may be optionally optimized.
References
-
Original Brovey formula reference unknown, probably
Roller, N.E.G. and Cox, S., 1980. Comparison of Landsat MSS and merged MSS/RBV data for analysis of natural vegetation. Proc. of the 14th International Symposium on Remote Sensing of Environment, San Jose, Costa Rica, 23-30 April, pp. 1001-1007
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Pohl, C., and J.L. van Genderen, 1998. Multisensor image fusion in remote sensing: concepts, methods and application. Int. J. of Rem. Sens., 19, 823-854.
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M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C. Furlanello, 2005. An integrated toolbox for image registration, fusion and classification. International Journal of Geoinformatics, 1(1):51-61 (PDF)
Releases
5 releases since Debian 4.0 (Etch); the text changed 4 times.